http://benji3up2kxewkqfcq7buxk2xd6zwy3zggnurkrm3l4cvwy2iipvyyad.onion/mirrors/gmpdoc/Demonstration-Programs.html
Going beyond something
minimal quickly leads to matters like user-defined functions, looping, fixnums
for control variables, etc, which are considered outside the scope of GMP
(much closer to language interpreters or compilers, See Language Bindings ).
Something simple for program input convenience may yet be a possibility, a
combination of the expr demo and the pexpr tree back-end
perhaps. But for now the above evaluators are offered as illustrations.